In this screen grab taken from video provided by I Tele, emergency services at the scene outside a factory where a man was allegedly beheaded, in Saint-Quentin-Fallavier, France, Friday, June 26, 2015. French authorities have opened an investigation after an attack and explosion at a gas factory that left one person decapitated and several wounded. Banners with Arabic inscriptions were found near the body, an official said. (I Tele via AP)
(The Associated Press)

A police officer guards a cross road as a reporter walks near the plant where an attack took place, Friday, June 26, 2015 in Saint-Quentin-Fallavier, southeast of Lyon, France. At least one man attacked a gas factory Friday in southeastern France, posting a severed head at the factory's entrance along with banners covered with Arabic writing, officials said. France immediately opened a terrorism investigation. (AP Photo/Laurent Cipriani)
(The Associated Press)

Investigating police officers work outside the plant where an attack took place, Friday, June 26, 2015 in Saint-Quentin-Fallavier, southeast of Lyon, France. French authorities say one person has been beheaded in an attack and explosion at a gas factory in the southeastern part of the country. Officials say banners with Arabic writing were found near the body. Authorities have opened a terrorism investigation. (AP Photo/Laurent Cipriani)
(The Associated Press)

PARIS – The latest on the attack in southeastern France (all times local):

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11:30 a.m.

A French security official says an attack and explosion at a gas factory in southeastern France has left one person dead.

The official, who spoke on condition of anonymity because she wasn't authorized to talk to the news media, said the dead person was found decapitated outside the entrance to the factory.

France's top security official was rushing to the scene. The official said two attackers arrived in a car, bearing banners written in Arabic, and set off an explosion. One of the attackers was arrested.